sim·i·lar 
(sĭmə-lər)
(sĭmə-lər)adj.
1. Having a resemblance in appearance or nature; alike though not identical.
2. Mathematics Having corresponding angles equal and corresponding line segments proportional. Used of geometric figures: similar triangles.
[French similaire, from Latin similis, like; see sem-1 in the Appendix of Indo-European roots.]
simi·lar·ly adv.